Cactus is a plant and the national flower of Mexico. It belongs to the desert plant Dianthus. Because of adapting to the climate of desert lacking water, leaves evolved into short spines to reduce water evaporation, and can also be used as a weapon to prevent animals from swallowing; The stem evolved into a thick and watery shape; At the same time, the root system covered by it is very large, and it absorbs the most rainwater when it rains heavily. At present, there are nearly 2000 species of cactus plants.

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